The answer is $7 because Marginal revenue is the change in total revenue from 10 customers ($400) to 11 customers ($407)  How a monopolist maximizes profits
How does a monopolist determine its profit-maximizing level of output How does it determine the price that it charges?
The monopolist will select the profit-maximizing level of output where 
                                        MR = MC
 and then charge the price for that quantity of output as determined by the market demand curve. If that price is above average cost, the monopolist earns positive profits.
How a monopolist maximizes profits 
 Because Chuck, a sole commercial airplane operator in small isolated town, has no  competition, he has complete control of market price of air travel in his small tone
  Reduced price → increase in ticket sales 
  Monopoly maximizes profit by choosing an amount of profit in which marginal revenue  equals marginal cost (MR= MC)  Since Chuck must reduce his price to sell more units, he has an incentive to sell a  smaller quantity than a perfective competitive company
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The option of saving money that offers the most liquidity is a piggy bank. (option C)
<h3>What is liquidity?</h3>
Liquidity can be described as the ease with which an asset can easily be converted to cash. Paper currency and coins is the most liquid assets. Real estate is illiquid because it takes a long time for a real estate asset (e.g a house) to be sold and proceeds converted to cash.
Liquid assets earn less returns when compared with assets that are less liquid. This is because illiquid assets earn an illiquidity premium. An illiquidity premium compensates holders for holding an illiquid asset. 
Money in a piggy bank is already in cash or coins and there is no need to convert it to cash again. Also, money in a piggybank is more accessible than the other options.
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<span>A flaw in the governor's reasoning is that a lot of people in that age bracket who are already juvenile delinquents aren't going to stop doing bad things just because they might get paid more at a job. Those people may just not want to have a job and would rather enjoy their youth causing trouble before they have to "settle" into a career.</span>
        
             
        
        
        
Answer:
"D"
Explanation:
Sales literature is a marketing approach strategy where apart from advertisements , a marketer uses collection of different materials like brochure , specification sheets ,price lists in enlightening customers towards making buying decision
Under the FINRA rule 2210, it must be delivered to more than 25 prospective clients.
Where it is providing testimonial concerning certain investment performance,it must disclosed that
-  the testimonials do no belong to others
- it is no guarantee of future performance
- if more than a nominal sum is paid and the fact that it is a paid testimonial